RT info:eu-repo/semantics/article
T1 Palaeoshoreline for the Late Cretaceous marine platform in the Iberian Trough (Leonese Area, Spain) deduced from outcrop and subsurface analysis
A1 Herrero Hernández, Antonio
A1 Gómez Fernández, Fernando
A2 Prospeccion e Investigacion Minera
K1 Ingeniería de minas
K1 Shoreline
K1 Sequence Stratigraphy
K1 Isobaths And Isopachs Maps
K1 Seismic Lineaments
K1 Late Cretaceous
K1 Iberian Trough
K1 3318 Tecnología Minera
AB [EN] The location of the Late Cretaceous paleoshoreline in the Leonese Area (Iberian Trough, Spain) has beeninvestigated by seismic analysis through isobath and isopach maps.The succession can be divided into two depositional sequences: DS-1 and DS-2. These sequences arecomposed of fluvial systems at the base, with paleocurrents that flowed eastward and north-eastward. TheDS-1 sequence (Late Albian-Middle Turonian) shows intertidal to subtidal and offshore deposits at the top, whilethe DS-2 sequence (Late Turonian-Campanian) presents intertidal to subtidal, tidal flat and shallow marine andlacustrine deposits at its top.The stratigraphic cyclicity based on systems tracts shows that these two depositional sequences exhibitremarkable eustatic control. Both sequences start at the base with a significant sedimentary supply from fluvialsystems, related to eustatic fall episodes, and conclude at the top with transgressive periods. The evolution ofthe basin reveals the history of base-level changes and associated shifts in depositional trends during successivestages.The deeper sectors of the DS-1 sequence are located towards the northeastern part of the study area while theproximal portion of the basin-margin is located to the southwest. The paleoshoreline is placed in a directionoriented at 120. The variations in thickness are elongated in orientations between 030 and 050 and are mainlyrelated to paleovalleys and tributary fluvial networks that supply sediment through the shoreline. It is possible thatthese variations may be related to active synsedimentary faults.Depocenters move toward the northeast and east during the DS-2 sequence while the proximal portion ofthe basin-margin moves to the southwest. The paleoshoreline has an orientation of 155 direction and movesbasinward. The isopach maps show a group of corridors oriented at 130-140 and 165-170, interpreted as resultof accumulation of sandy bodies such as inter and subtidal bars. The fluvial systems are transversal to thepaleoshoreline direction
PB Springer Nature
LK https://hdl.handle.net/10612/20597
UL https://hdl.handle.net/10612/20597
NO Herrero-Hernández, A., & Gómez-Fernández, F. (2012). Palaeoshoreline for the late cretaceous marine platform in the iberian trough (Leonese Area, Spain) deduced from outcrop and subsurface analysis. Central European Journal of Geosciences, 4(3), 395-415. https://doi.org/10.2478/S13533-011-0067-6
DS BULERIA. Repositorio Institucional de la Universidad de León
RD Jul 11, 2024